Not he slightest idea. One of the strangest things in PC experience after 40 years! Haven't looked into this matter deeply yet. Should there be a strange process running? I don´t know. I might be able to record what I see, the maximizing and downsizing, using Geforce experience, but I recorded only parts of games so far. It seems the maximizing reaches a peak point, from which further maximizing isn't possible anymore and reverts one step. Ich switched ScreeshotCaptors default format to JPG. So the problem vanished.